The trick is to use the curl command, which is used to download files at the command line. Therefore, first you’ll need to open the Terminal window, which you’ll find in the Utilities folder of the Applications list within Finder.

You’ll also need a file to download, and ideally one located on a server that’s fast. Luckily the superb ThinkBroadband website offers a handful of demo files you can download solely for speed-testing purposes.

For example, the following single-line command will download a 200MB test file – copy and paste it into the Terminal window as one line:

curl -o /dev/null http://download.thinkbroadband.com/200MB.zip

Look at two headings in particular in the output. For your average download speed, look at the Average Dload heading. To see the peak download speed, which is to say the speed at which your Net connection maxes out, look for the highest value under the Current Speed heading. This will constantly change based on Internet congestion, your local hardware, and the server load.

Note that although the command downloads a file, it’s immediately deleted – it’s sent to /dev/null, which is like a black hole in your system down which data vanishes.

You haven’t got to download the whole file for the test and can quit when you’re satisfied by pressing Ctrl+C (that’s CTRL and not CMD!).

Don’t forget that for best results you should use a wired (Ethernet) connection to your router, to remove any potential slowdowns introduced by Wi-Fi.

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I tried using this Curl command and it gave the most inconsistent results I have ever seen, showing that I was downloading data anywhere from 6 to 60 Mbps. I don’t think so. It seems that the website could be severely overloaded for this task. I don’t know what it would just to such unbelievably high numbers (I have a 25 Mbps connection) but the bottom line is that its just not usable or useful

Bob, it sounds like you need to find a large file near where you’re based for best results. You might try downloading one of the Office 2016 files linked to in today’s blog postings here at Mac Kung Fu. These use Microsoft’s content distribution network that should be fast and unhindered.